Question about Microwave Ovens
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
Here's a link to this great service
Posted on Jan 02, 2017
A microwave can be dead for many reasons.
If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.
If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.
Then when it cools, it closes the circuit and allows power through again.
When checking thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.
If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.
If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.
If it goes dead or blows the breaker when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.
If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.
You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and
put it back in, then test it again.
If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.
If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk
You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383
There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.
We're happy to help and we appreciate your thoughtful rating of our answer.
Posted on Jun 29, 2008
Tips for a great answer:
Oct 19, 2014 | Microwave Ovens
Apr 14, 2013 | GE Microwave Ovens
Sep 18, 2011 | GE Spacemaker JVM1640SJ Microwave Oven
Jun 18, 2011 | GE Spacemaker JVM1640SJ Microwave Oven
Aug 02, 2010 | GE Spacemaker JVM1640SJ Microwave Oven
Apr 25, 2009 | GE Spacemaker JVM1640SJ Microwave Oven
Mar 05, 2009 | GE Spacemaker JVM1640SJ Microwave Oven
Jul 17, 2008 | GE Spacemaker JVM1640SJ Microwave Oven
27 people viewed this question
Usually answered in minutes!